A summary of the shortcut keys is available here.
Note that this program calculates who starts, arranges players in table number sequence of tournament position, and enables the user to change, delete or add a player after names have been entered. It cannot cope with tournaments longer than 28 rounds.
Also download the program touprint.exe which will displays the pairings in your web browser (no internet connection needed), and thus gives more flexibility in printing (you can choose which printer and alter the print size).
The resultant *.tou file is also suitable for input into ratings software for the purpose of calculating player ratings.